Water-tube boiler.



PATENTED- NOV. 3, 1903.

W. J. DUGAN- WATER TUBE BOILER.

APPLIOATIQR rum) mu 1, 1903.

I0 MODEL.

m: uomus FFl'cRs co., PhOTO-L'TNO. WASHINGTON. a. c.

Patented November 3, 1 903.

PATENT OFFICE.

WILLIAM J. DUGAN, OF KANSAS CITY, MISSOURI.

WATER-TUBE BOILER.

SPECIFICATION forming part of Letters Patent No. 742,847, dated November3, 1903. Application filed May 1,19o3. Serial No. 155.113. (No man.)

To all whom it may concern:

Be it known that I, WILLIAM J. DUGAN, a citizen of the United States,residing at Kansas City, in the county of Jackson and State of Missouri,have invented certain new and useful Improvements in VerticalVVater-Tube Boilers, of which the following is a specification.

This invention relates tovertical water-tube boilers, and has for itsobject to produce a boiler of the type mentioned whereby steam can begenerated quickly, which is accessible for repairs and cleaning, andwhich is of simple, strong, durable, compact, and comparatively cheapconstruction.

With these objects in view the invention consists in certain novel andpeculiar features of construction and combinations of parts, ashereinafter described and claimed, and in order that it may be fullyunderstood reference is to be had to the accompanying drawings, inwhich- Figure 1 is a vertical central section of a boiler embodying myinvention. Fig. 2 is a horizontal section on the line II II of Fig. 1.Fig. 3 is a horizontal section of a modified form of the boiler asviewed downwardly. Fig. 4: is a horizontal section of the type of boilershown in Fig. 3, but with the section taken in a plane just above thetopmost flue and looking upward.

Referring to the drawings in detail, 1 designates the foundation portionof the boiler, and 2 the grate thereof.

3 is the cylindrical inner shell, forming the combustion-chamber andprovided with an annular crown-sheet 4, from which centrally depends alarge tube 5, closed at its lower end and provided with a drain-pipe 6,leading off through the shell and equipped externally thereof with avalve 7.

Near its upper end shell 3 is provided with a series of short fiues 8,which project outwardly through the boiler-shell 9, said boiler bypreference concentrically surrounding the combustion-shell and securedto the latter by the base-ring 10, the opposite ends of fines 8 being ofcourse upset or expanded in the usual or any preferred manner.

11 designates alarge number of water-tubes arranged radially bypreference, as shown, and projecting at their opposite ends throughshell 3 and tube 5, a workman, who is lowered or lowers himself intotube 5, upsetting or expanding the inner ends of the tubes from thatposition. The outer ends are upset or expanded in the customary mannerthrough the hand-holes 12, which are afterward hermetically sealed inthe customary manner by the hand'hole devices 13. This constructionobviously enables the person in control to easily and quickly clean thetubes or to replace a defective one.

14 is a fuel-door controlling the opening leading through shells 3 and 9to the combustion-chamber, and 15 is a manhole in the crown-sheet of theboiler, through which the workman enters for the purpose of makinginternal repairs of the character mentioned or of any other character.Said manhole is controlled by the usual devices, as at 16.

17 designates perforated steam-pipes disposed in the dome portion of theboiler and connected to the coupling 18 at the end of thesteam-distributer pipe 19, the latter extending through the top of theboiler.

20 designates a circular band secured to the boiler and forming thebottom of a cylindricalshell 21, the same being provided with a conicaltop 22, through which extends pipe 19. This top is provided with a largeopening 23, registering by preference with opening 15 and controlled bya suitable door 24, and connected to the upper end of the top is asmokestack 25 to carry off the products of combustion, which pass fromthe combustion-chamber out through lines 8 into the smoke-box,comprising portions 20, 21, and 22, above referred to.

In operation the boiler is filled to approximately the water-line,(indicated in Fig. 1,) so that the Water shall completely surround thecombustion-chamber and the combustionflues 8 and, furthermore, shall bethoroughly circulated, and thereby raised to the necessary temperaturemore quickly, because it fills the large tube 5, which, depending intothe combustion-chamber, is subjected to a' heat as intense as thewater-tubes 11. The steam thus quickly generated is, in effect,superheated until its escape by way of the steam-pipe 19 by thesmoke-box surrounding the upper part of the boiler and protecting itfrom the outside air above its water-line.

In Figs. 3 and 4 I show a boiler to develop a much smaller horse-powerthan the other, this boiler comprising the two shells 3 and 9, with theformer communicating directly with the smoke-stack 25 and with the tubes11 extending clear across the combustion-chamber, with their oppositeends upset or expanded by introducing an expander through hand-holes 12,as hereinbefore explained, and in this connection it should be statedthat the fireman or engineer is capable of replacing a defective tube ineither of these boil ers with a perfect one, and thus is enabled to savenot only the cost of such work, but the time frequently required to getskilled labor when needed. The construction shown in Figs. 3 and 4, itwill be seen, is analogous to that of Fig. 1, except that the former isprovided with no smoke-box inclosing the dome portion of the boiler andwith no tube 5 for the purpose of permitting the inner ends of tubes 11to be expanded and for the further purpose of providing additionalheatingsurface for contactwith the water.

With the boiler shown in Fig. 3 of coinparatively small diameter thetubes 11 are not sufliciently long to be objectionable, and the water isconverted into steam with sufficient rapidity without the additionalheating-surface represented by said tube 5.

From the above description it will be apparent that I have produced avertical water-tube boiler which is sufficiently accessible for repairsand cleaning by the fireman or engineer, which provides for rapidcirculation of water and generation of steam,

which occupies a comparatively small space,

and cheap construction, and while I have illustrated and described thepreferred embodiments of the invention it will be apparout that it issusceptible of modification as regards its form, proportion, detail,construction, and arrangement of the parts without departing from itsessential'spirit or scope or sacrificing any of its advantages.

Having thus described the invention, what I claim as new, and desire tosecure by Letters Patent, is-

A vertical water-tube boiler, comprising a combustion chamber having anannular crown sheet, a tube depending from said crown-sheet into thecombustion-chamber and having its lower end closed, a valve-controlleddrain-pipe communicating with said closed end, a boiler surrounding thecombustionchamber, and provided with controlled handhole openings, tubesextending through the combustion-chamber in line with said handholeopenings and communicating at their opposite ends with the boiler andsaid depending tube, a fuel door controlling access through the boilerand combustion-chamber to the latter, a steam-pipe communicating withthe boiler, and a smoke-stack com municating with thecombustion-chamber.

In testimony whereof I affix my signature in the presence of twowitnesses.

- WILLIAM J. DUGAN.

Witnesses:

H. C. RODGERS, G. Y. THORPE.

